Special case diagonal Q in adaptive QR

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

Merging #67 (c2fa5a4) into master (ea16648) will increase coverage by 3.36%.
The diff coverage is 90.00%.

@@            Coverage Diff             @@
##           master      #67      +/-   ##
==========================================
+ Coverage   66.70%   70.06%   +3.36%     
==========================================
  Files           9        9              
  Lines         949     1019      +70     
==========================================
+ Hits          633      714      +81     
+ Misses        316      305      -11     

Impacted Files	Coverage Δ
src/blockbanded/blockbanded.jl	81.08% <0.00%> (+20.47%)	⬆️
src/InfiniteLinearAlgebra.jl	80.00% <100.00%> (+5.00%)	⬆️
src/banded/hessenbergq.jl	60.41% <100.00%> (+4.37%)	⬆️
src/infqr.jl	95.79% <100.00%> (-0.02%)	⬇️
src/inful.jl	100.00% <0.00%> (ø)
src/infql.jl	34.18% <0.00%> (+1.02%)	⬆️
src/blockbanded/infblocktridiagonal.jl	82.22% <0.00%> (+1.73%)	⬆️
src/banded/infbanded.jl	71.42% <0.00%> (+2.67%)	⬆️
... and 2 more

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